From acab26a2408cd07024376f84ed566ae1ba7ee52b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Voltz?= <stef.dev@free.fr>
Date: Wed, 3 Feb 2010 06:20:52 +0100
Subject: [PATCH] add safeguard in gray normalization

---
 backend/genesys_conv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/genesys_conv.c b/backend/genesys_conv.c
index 7a4873f80..779355f5c 100644
--- a/backend/genesys_conv.c
+++ b/backend/genesys_conv.c
@@ -122,6 +122,11 @@ binarize_line(Genesys_Device * dev, uint8_t *src, uint8_t *dst, int width)
 	    min = src[x];
 	  }
       }
+    /* safeguard againt dark of white areas */
+    if(min>80)
+	    min=0;
+    if(max<80)
+	    max=255;
     for (x = 0; x < width; x++)
       {
 	src[x] = ((src[x] - min) * 255) / (max - min);